PLANARIA. 11 



2. P. torva, cinereous or black on the dorsal, greyish on the ventral 

 surface ; the front obtuse, rounded on the angles and projecting in 

 the centre ; eyes each with a white halo. Length 6'" ; breadth 

 H-2'". 



Fasciola torva. Mull. Verm. i. ii. 62 (1773). 



Planaiia torva, Miill. Zool. Dan. Prod. no. 2688 ; Zool. Dan. iii. 48. 



tab. 109. f. 5, 6. Turt. Gmel. iv. 64. Bosc, Vers, i. 303. pi. 8. f. 9. 



Lam. An. s. Vert. iii. 179 ; 2(le edit. iii. 607. Blainv. Diet, des Sc. 



nat. Atlas Entomoz. pi. f. 11 (where it is given as a magnified 



figure of Polycelis nigra). Baer in Nov. Act. Curios, xiii. 705. 



tab. 33. f. 4-6 & 12-17. IV. Thompson in Ann. S,- May. Nat. Hist. 



xviii. 389 ; ibid. ser. 2. vii. 502. Oersted, Entw. Plattw. 54. Dies. 



Syst. Helm. i. 205. Moquin-Tandon, Monogr. Hirud. 200. 

 Ilirudo alpina, Dana in Moquin-Tandon, Monogr. Hirud. 17 & 200, 



note 3. 

 Planaria fiisca, Eees' Cyclop, xxvii. art. Planaria. Stew. Elem. ii. 355. 



Templeton in Loudon's Mag. Nat. Hist. ix. 239. Byerley, Faun. 



Liverp. 99. 

 Planaria subtentaculata, Duges in Ann. des Sc. Nat. xv. 144. pi. 4. 



f. 13, 22-24. 



Hab. In lakes and runlets, more especially in those descending from 

 elevated grounds. I believe rare. 



Obs. I can find no proof that Pl./usca of Pallas or of Duges (for 

 it is not certain that they are synonymous) is indigenous. Those 

 authors who have introduced it into their lists have not critically 

 examined the genus. The same remark may be made of Planaria 

 sf agnails, Miill. Templeton has introduced it into his Irish list 

 {Loud. Mag. N. Hist. ix. 239) ; but he gives no description, nor 

 mentions any locality. 



3. P. arethusa, truncate and auriculate in front, leaden or slate-grey, 

 paler underneath ; a black eye on a white spot on each side of the 

 medial line in front. Length 6'" ; breadth 1'". 



Planaria ai'etbusa, Daly ell. Planar. 85. f. 11-14. W. Thompson in 

 Ann. c^ Mag. Nat. Hist. ser. 2. vii. 502, Dalyell, Pow. Great, ii. 

 lll.pl. 16. f. 10-19. 



Planaria torva, Johnson in Phil. Trans. 1822, pi. 49. f. 2, 8, 14, and 

 ibid. 1825,251. 



Hab. In pure springs and rivulets : common. 

 («) Dods'-well, Berwick, Dr. Johnston. 



4. P. edinensis, linear-oblong, rather narrowish forwards, pale car- 

 nation; head obtuse, rose-colour; eyes nearly marginal in the 

 rose-coloured part. Length 3'" ; breadth 1'". 



Planaria edinensis, Dalyell, Planar. 133. f. 18 (1814). Dies. Syst. 



Helm. i. 282. 

 Dalyellia edinensis, Johnston in Ann. <5" Mag. Nat. Hist. xvi. 438. 



Hab. In pure springs : rare. 



